This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 7 |
| 6 | 4 |
| 7 | 173 |
| 8 | 587 |
| 9 | 1481 |
| 10 | 1859 |
| 11 | 20701 |
| 12 | 18391 |
| 13 | 241393 |
| 14 | 275713 |
| 15 | 148367 |
| 16 | 548423 |
| 17 | 2342059 |
| 18 | 241321 |
| 19 | 41436061 |
| 20 | 19263077 |
| 21 | 40604659 |
| 22 | 43779103 |
| 23 | 1009564739 |
| 24 | 1907583043 |
| 25 | 9002492327 |
| 26 | 9603126977 |
| 27 | 27322095131 |
| 28 | 25887926681 |
| 29 | 752184042199 |